Abstract:
In order to find the optimal ratio of inorganic double liquid materials and improve the coal fixing effect of materials, based on the mechanism of coal wall reinforcement, four factors such as fluidity, setting time, compressive strength and bond strength are selected as evaluation parameters. Then the optimization experiment of material ratio is carried out by single factor control method. The results show that when the ratio of water to cement, the ratio of lime to gypsum, the content of water reducing agent and the content of suspension agent are 0.7, 1∶7, 0.25% and 0.3% , respectively, the performance of the inorganic double liquid materials can reach the best. The deformation trend of coal reinforced by grouting before and after the optimization of material ratio is the same, and the four stages of compaction, elasticity, yield and failure are successively experienced under compression conditions, but the load resistance and deformation resistance of the cemented coal after optimization are obviously improved. Under uniaxial and triaxial compression conditions, the consolidated coal mostly produces compressor-tension-friction mixed failure, and the coal block fracture occurs after the optimized material reinforcement, which further reveals that the optimized inorganic double liquid material has better coal consolidation effect. Although the optimized inorganic material is difficult to achieve the effect of Marisan grouting reinforcement, it can avoid the shortcomings of high reaction temperature, high price and difficult preparation, which can provide a reference for the research of coal wall grouting reinforcement materials.